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I got code P1646 on my 2001 Deville, I'm thinking it's a program fault or gone bad?

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I got the code P1646 on my 2001 Cadillac Deville, obviously, I'm thinking it's a program fault or gone bad?

Vehicle: 2001 Cadillac Deville

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P1646 CADILLAC - EVAP Vent Solenoid Output Circuit

Read more: https://www.autocodes.com/p1646_cadillac.html

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